Believe it or not, reading the perl6 summaries (thanks, pd!) has gotten me to look at other "meta-compiled" languages, in particular, Tcl and Smalltalk.
I have to say, I really like the semantics of Tcl (the source-level language) (though the syntax is perhaps slightly less than ideal), and I really REALLY like the execution semantics of the smalltalk virtual machine. But the syntax of Smalltalk is heinously hideous! I wonder if there are any other languages that have back-ends targeting the smalltalk vm? I almost wish the perl6 guys had considering using the smalltalk vm, at least as a starting point. So much good work has already been done on virtual machines, and I'm not convinced that reading a few papers is enough to allow one to say that he is not reinventing the wheel.